linux-kernel - Re: commit 271e1b86e691 is breaking DMA uart on SoCFPGA

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Date:	Tue, 23 Feb 2016 09:14:38 -0600
From:	Dinh Nguyen <dinguyen@...nsource.altera.com>
To:	Alexander Kochetkov <al.kochet@...il.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
CC:	Vinod Koul <vinod.koul@...el.com>, <shawn.lin@...kchips.com>,
	Addy Ke <addy.ke@...k-chips.com>,
	Boojin Kim <boojin.kim@...sung.com>, <wxt@...k-chips.com>,
	<dmaengine@...r.kernel.org>, olof Johansson <olof@...om.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: commit 271e1b86e691 is breaking DMA uart on SoCFPGA

Hi,

Sorry that I couldn't get to this sooner.

On 02/18/2016 10:07 AM, Alexander Kochetkov wrote:
> Hello!
> 
> Bartlomiej, could you please tell what uart driver is used on Samsung
> Exynos4412?
> Dinh, could you please tell what uart driver is used on SoCFPGA?
> 

SoCFPGA is using the 8250_dw.c uart driver.

> Could you make two test?
> 
> 1) Checkout tree at commit 848e9776fee4 "dmaengine: pl330: support
> burst mode for
>  dev-to-mem and mem-to-dev transmit", make it buildable and see is it
> works. In order to make in buildable remove bursts argument from the
> line:
> 
>     if (*bursts == 1)
>     - return _bursts(pl330, dry_run, buf, pxs, 1);
>     + return _bursts(dry_run, buf, pxs, 1);
> 

This case still fails for me.

> 2) Checkout next-20160211 kernel tree and set src_maxburst and
> dst_maxburst to 1 inside UART driver to see is it works?
> 

This case works and the UART is able to operate in DMA mode.

Dinh